Electrical induction-furnace.



0. c. B O CKMAN ELECTRICAL INDUCT URNACE. APPLICATION FILED .1918-1,275,206.

Patented Aug. 13, @3918.

on nonennnnj nenn ny.

ELEUTlR-IGAL INTBUCTIOIWFU'RNACE,

specification of Letters Patent.

Patented Auggx Apnlleatien filed may 52, 1918. Serial No: 232,272.

To all 101 mm 5?? concern Be it known that i. OLUF CHRISTIAN Boommn, aeubgeet of the King of Norway,

residing nt iloeccldcn, in the Kingan-m oi" etheis skilled in the towhich it nppen tains make and use the same, reference being heal. in theaccompanying drawings, and to i em or .iigni'es of reference markedthem-on, "winch form a, m. of this specification. I

In the kiwi n type of elel furnaces she ieguln nn of load oarzieci outby regulating tension of 'bhe electric current or by cutting in or outwindings of the indueiion coils.

In several instances it is however do simble to regulate the load; of aninduction furnace indepenrienf oi" the current passing through ihe coilsof the $311K), and in this case generally 1 wary low'cos. p for thefurnace may be. permitted.

This is Olilt-Zl-ilifid according to the present invention, two fm'iusof which are diagram,- innticaliy illusli'atei'i on l'hc drawing.

Figural is a sectional View fibrough a single-phase induction furnaceaccording to the present system, and 2 is a plan of a thine phaseinduction furnace.

According to the lilVflllilOll the magnet core 1 is so const-rueied thatthe magnetic flux can either be comlucieil thi'mig'h the furnace oroutside the suineihrough a mag?- nctic comiccion located in parallel tothe magnetic COIIDEClHH} of the flu'nucc.

This, as illnstznle l on ihe chiming, nniy obtained by means of apivoted pin-l; n l n Elmi F l in, mu nu anion.) i insinnu, on in. The.coil u may he surroumlcd by a prohe of tectingz shell 4 by means oiwhich (he coil .riei out otherwise than in i :e in

in incl uclien .When the smelting channels have difiiei'entcross-sections, so that, the tenipeiraiii'ee in.

some channels become higher.- uiien in other-s.

The furnace should he brick lined and pro "aided with doors and tappingholes, and

itniey be mounted stationery OI e iiiling iui'nece in any known manner.

Ii, 13 elem: that the invention may he waited on the drawing, and i'sheEDVBRLMMI it"; not limited to these mediiicailione, the innin fealaureof the invention being ihe arm-Eigement of n regula-ble magnet flux painin she magnet system of the furnace.

I claim:

- 1. In an electric induction furnace ihe an rangement in pa 'ailel withfihe orninery path of inagnetiefiux of ii i'egula hie magnetic flux pathwith the object of permittingyg regulation of the furnace temperatureindependent of the current andmagnetie eois.

2. in. an eleeh'ic polypnez:,, inclueiio i 11- nuce the iii'i'nngeinentin each sepui-ul'e phase of the Iurnace of n i'eguiebie path of themagnetic flux in parallel to the oi' iliznir'y nnigneisic flux path withthe ohjeotq f p mitting regulation of each se'painie phiee of thefurnace, independent of the other phases and of the current and magnetcoiis.

3. In an electric induction furnace an iniluotion coil, :1 corefoi-nyhi-g u closed path for the magnetic flux created by the said coil,suid core coinpz-isingiin extension out- Side the furnace and means forregulating the magnetic flux in said extension.

4. In .un electric induction furnace. an induction coil a core forming aclosed. path for the magnetic flux created by the said coil an extensionon said core (nits-aide the furnace, said extension comprising n pivote;member by means of which the pafih formed by ihc 523.1116 may be closedor innermpterl. Wii'h the object of rcguliiting the magnetic flux in themain core.

in testimony that I claim the ioii egeing as my inveniion, I have signedmy name in presence of two subsc 'ibing'witnwses.

new CHRISTIAN nooiinnn.

' Witnesses;

C. VOBMAN, THs. Hnnz.

